need help daily driver wont start

Daddyo

Daddyo

Forum Member
Ok it's a 1991 ford f250. hears what I got so far. Put the key in and I get nothing so sound no dash lights nothing. but when i jump out the starter relay it will start and then stop after a second. i checked all the fuseable links on the starter relay and they are good. but i did get one of the lines that comes off the relay to start the truck from the key but only when i put the line directy on the 12 volt side of the relay. my haynes manual is useless. so anybody have any more ideas for me to check before i have to spend money to have it tow and checked out at a repair shop. thank you in advance.
 
Sounds like a bad relay or ignition switch, the stopping is probably due to an immobilizer of some sort

Daddyo said:
Ok it's a 1991 ford f250. hears what I got so far. Put the key in and I get nothing so sound no dash lights nothing. but when i jump out the starter relay it will start and then stop after a second. i checked all the fuseable links on the starter relay and they are good. but i did get one of the lines that comes off the relay to start the truck from the key but only when i put the line directy on the 12 volt side of the relay. my haynes manual is useless. so anybody have any more ideas for me to check before i have to spend money to have it tow and checked out at a repair shop. thank you in advance.
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already changed the ignition switch in the steering wheel. thats what the haynes told me to do. but it says nothing about immobilizers. where would i look first? neutal safty switch fuel pump? like i said the my manual is useless.

that you for you comment
 
time to get out a test light and some shcematic and start chassing power around the truck. Make sure to use a test light with a bulb not an LEd. they tend to show false positives becuase they don't require alot of power. Also make sure to test the circut with demand on it. I have seen low amount of conductivity light up a test light but when you put on demand it goes open from a poor connection.

Daddyo said:
replaced both pos and neg cables.
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